技术领域technical field
本发明涉及一种基于电能友好空调负荷侧主动需求策略。The invention relates to an active demand strategy based on an electric energy-friendly air conditioner load side.
背景技术Background technique
空调作为建筑物的主要设施，由于能提供给人们舒适生活或生产需要的特定空间空气温度、相对湿度、洁净度、噪音或空气流速等被越来越多的企事业单位或群体使用，所以伴随中华大地建筑主体完工而出现了空调配置数量的飞速攀升。空调数量的日益庞大意味着建筑用能需求的不断提升。为响应节能政策，许多空调厂家推出了变频空调，但是节能的变频空调大量接入电网又会对电网造成大量谐波，影响其他设备的正常运行，也影响电能质量。变频运行造成的高次谐波误触发晶闸管导通，也会导致系统失控。因此，未来的电网侧或负荷侧设计相应的谐波主动抑制电路，以实现电网友好型负荷目标尤有必要。As the main facility of a building, air conditioning is used by more and more enterprises and institutions or groups because it can provide people with a comfortable life or a specific space for production needs, such as air temperature, relative humidity, cleanliness, noise or air velocity. The completion of the main body of the building in the land of China has seen a rapid increase in the number of air-conditioning configurations. The increasing number of air conditioners means that the demand for building energy continues to increase. In response to energy-saving policies, many air-conditioning manufacturers have launched inverter air conditioners, but a large number of energy-saving inverter air conditioners connected to the power grid will cause a large number of harmonics to the power grid, affecting the normal operation of other equipment and affecting power quality. The high-order harmonics caused by frequency conversion operation falsely trigger the conduction of the thyristor, which will also cause the system to run out of control. Therefore, it is especially necessary to design corresponding harmonic active suppression circuits on the grid side or load side in the future to achieve the grid-friendly load target.
高峰负荷无功不足会造成电压崩溃，甚至导致整个系统瓦解。这无疑给正常的社会经济秩序和人民的日常生活带来了极大的影响，在当前电力供求矛盾非常突出的情况下，如何友好用电，提高中央空调冷却水系统、冷冻水系统和整个空调主机的运行效率，降低其能耗是当务之急，新型的高效节能空调系统已成为空调领域技术开发的首要任务。国家标准规定的中央空调系统最大负载能力是按照当地的最高气温、最大负荷工作环境来设计的，而中央空调98％的时间在70％负载上下波动，所以系统运行控制设计存在较大余量。要较好实现节能和舒适功能目标，尽量减少对电网电能质量影响，这些都离不开科学的控制及低电压跌落防治与谐波治理技术。有人通过对大量引起电网电压畸变而形成谐波的变速空调（VSAC）统计分析，表明变频空调是国内引起电压畸变的大型负荷之一。Insufficient peak load reactive power will cause voltage collapse and even cause the entire system to collapse. This undoubtedly has a great impact on the normal social and economic order and people's daily life. In the current situation where the contradiction between power supply and demand is very prominent, how to use electricity friendly and improve the central air-conditioning cooling water system, chilled water system and the entire air-conditioning system? The operating efficiency of the main engine and the reduction of its energy consumption are urgent tasks. A new type of high-efficiency and energy-saving air-conditioning system has become the primary task of technological development in the field of air-conditioning. The maximum load capacity of the central air-conditioning system stipulated by the national standard is designed according to the local maximum temperature and maximum load working environment, and the central air-conditioning fluctuates around 70% load 98% of the time, so there is a large margin in the system operation control design. To better achieve energy saving and comfort function goals, and minimize the impact on the power quality of the grid, these are inseparable from scientific control, low voltage drop prevention and harmonic control technology. Some people have made a statistical analysis of a large number of variable speed air conditioners (VSAC) that cause harmonics due to voltage distortion in the power grid, indicating that frequency conversion air conditioners are one of the large loads that cause voltage distortion in China.
随着大规模互联电网的迅猛发展，风电、太阳能等波动性能源的大规模接入以及各类电力负荷的快速增长，传统电网的脆弱性日益突显，夏季高峰时段的空调负荷高比例，加上随伴雾霾天气诞生更多的空气净化新产品的投入，势必加剧电网不稳定性，增加电网负担。在考虑负荷运行功能需求特性分析基础上，进行负荷节能运行电能友好调度设计，顺应国家当前节能减排口号，具有积极意义。With the rapid development of large-scale interconnected power grids, the large-scale access of wind power, solar energy and other variable energy sources, and the rapid growth of various power loads, the vulnerability of traditional power grids has become increasingly prominent. The high proportion of air-conditioning loads during peak summer hours, coupled with With the smog weather, more investment in new air purification products will inevitably aggravate the instability of the power grid and increase the burden on the power grid. On the basis of considering the analysis of load operation function demand characteristics, it is of positive significance to carry out the design of energy-friendly dispatching of load energy-saving operation and conform to the current national slogan of energy conservation and emission reduction.
发明内容Contents of the invention
本发明的目的在于提供一种解决分布式空调系统节能技术与电网供电电能质量矛盾问题的基于电能友好空调负荷侧主动需求策略。The purpose of the present invention is to provide an active demand strategy based on the power-friendly air-conditioning load side that solves the contradiction between the energy-saving technology of the distributed air-conditioning system and the power quality of the power grid.
本发明的技术解决方案是：Technical solution of the present invention is:
一种基于电能友好空调负荷侧主动需求策略，An active demand strategy based on electric energy-friendly air conditioner load side,
步骤1.供电侧与负荷侧之间直流母线侧设计Z型低电压穿越及谐波预防电路，在非线性负荷群变频启动时缓冲电流突变对电网的影响。设置电网监测，严重低电压穿越及电网其它紧急电网故障故障下，紧急切断电网侧电源供应，硬件互锁联动电路启动储能电源供电直流母线，通过DC-AC逆变供电负载工作。紧密结合负荷预测，电池储能与负荷错峰管理相结合，直流母线与储能电池之间双向充放电电路，在用电低谷时段充分利用电能进行储能，用电高峰时段储能释放，实现部分负荷移峰填谷，保证空调负荷正常运行。当用电高峰电池荷电状态不足以维持负荷正常运行，同时室内温度及湿度监测在人体适应度一定范围内时，结合中央空调系统在冷热源发挥作用或消退方面存在的时间延迟特性，临时采用空调系统设备暂停策略。Step 1. Design a Z-type low-voltage ride-through and harmonic prevention circuit on the DC bus side between the power supply side and the load side to buffer the impact of sudden current changes on the power grid when the nonlinear load group starts with frequency conversion. Set up grid monitoring, severe low voltage ride through and other emergency grid faults, cut off the power supply on the grid side in an emergency, and the hardware interlock linkage circuit starts the DC bus powered by the energy storage power supply, and the load is powered by the DC-AC inverter. Closely combined with load forecasting, battery energy storage and load staggered management, bidirectional charging and discharging circuit between DC bus and energy storage battery, full use of electric energy for energy storage during low power consumption periods, and energy storage and release during peak power consumption periods, to achieve Part of the load shifts peaks and fills valleys to ensure the normal operation of air conditioning loads. When the state of charge of the battery during the peak power consumption is not enough to maintain the normal operation of the load, and the indoor temperature and humidity monitoring are within a certain range of human body adaptability, combined with the time delay characteristics of the central air-conditioning system in terms of the effect or fading of the cold and heat sources, temporary Adopt an air conditioning system equipment suspension strategy.
步骤2. 根据步骤1所述一种基于电能友好空调负荷侧主动需求策略，电池充放电行为的控制与管理其特征在于：所述电池储能装置BESS(储能电池系统) SOC（电池荷电状态）管理采用出厂实验数据与现场实时监测数据相结合。采用如下步骤进行:Step 2. According to an active demand strategy based on the power-friendly air conditioner load side described in step 1, the control and management of battery charging and discharging behavior is characterized in that: the battery energy storage device BESS (energy storage battery system) SOC (battery charge State) management adopts the combination of ex-factory experimental data and on-site real-time monitoring data. Take the following steps:
步骤2-1.采用厂家提供实验曲线与实时在线监测采样数据相结合，对充放电电流进行积分计算，结合充放电周期及先前实测数据，动态修正充放电曲线变化，获取当前动态荷电状态变化趋势，尽可能准确进行电池剩余容量动态预测与实时计量。Step 2-1. Using the combination of the experimental curve provided by the manufacturer and the real-time online monitoring sampling data, the integral calculation of the charge and discharge current is carried out, combined with the charge and discharge cycle and the previous measured data, the change of the charge and discharge curve is dynamically corrected, and the current dynamic charge state change is obtained. Trends, dynamic prediction and real-time measurement of battery remaining capacity as accurately as possible.
步骤2-2.双向DC-DC控制器设计，由于系统中储能电池充当电网负荷与空调负荷电源的双面角色，涉及功率电流频繁流入及流出，选用双向DC-DC控制电路。Step 2-2. Bidirectional DC-DC controller design. Since the energy storage battery in the system acts as a double-sided role for the grid load and air-conditioning load power supply, involving frequent inflow and outflow of power current, a bidirectional DC-DC control circuit is selected.
步骤3. 一种基于电能友好空调负荷侧主动需求策略，其中谐波处理采用硬件器件电路与软件编程相结合，包括如下步骤：Step 3. An active demand strategy based on the energy-friendly air conditioner load side, in which the harmonic processing uses a combination of hardware device circuits and software programming, including the following steps:
步骤3-1. 在变换器的电网侧及直流母线侧设置一定谐波阶次的滤波电路，直流母线侧加装超级电容吸收高次谐波，抑制电压波动，吸纳两侧在此交合的部分谐波，避免衍生新的谐波频率；变换器与负荷之间施加滤波环节，作为RLC无源滤波器，可以再滤去一部分高频谐波。Step 3-1. Set up a filter circuit with a certain harmonic order on the grid side and the DC bus side of the converter, and install a super capacitor on the DC bus side to absorb high-order harmonics, suppress voltage fluctuations, and absorb the intersection of the two sides here Harmonics, to avoid deriving new harmonic frequencies; a filtering link is applied between the converter and the load, as an RLC passive filter, which can filter out part of the high-frequency harmonics.
步骤3-2. 考虑仅用无源滤波器，需要的滤波器件繁多，消除的谐波的频率范围不完整，附加费用高，速度慢，能耗大，在简单无源滤波基础上引进高功率有源滤波器。结合监测负载端的电流电压，与电源端锁相环出来的参数值进行比较，通过调节变换器的PWM来消除低频谐波。Step 3-2. Consider using only passive filters, which require a large number of filter components, the frequency range of harmonics to be eliminated is incomplete, high additional costs, slow speed, and high energy consumption. Introduce high power on the basis of simple passive filtering. active filter. Combined with monitoring the current and voltage at the load end, compare it with the parameter value from the phase-locked loop at the power supply end, and eliminate low-frequency harmonics by adjusting the PWM of the converter.
本发明所述一种双馈风力发电机系统采用以上技术方案与现有技术相比，具有以下技术效果：Compared with the prior art, a doubly-fed wind power generator system according to the present invention adopts the above technical scheme and has the following technical effects:
（1）考虑空调负荷占比整个电网负荷较高，运行时段比较集中，对电网容量需求越来越高等需求特性。创新性引进储能电池，在用电负荷高峰时期，切入储能系统作为空调负荷电源，削峰调谷，主动参与电网调度。(1) Considering that the air conditioner load accounts for a relatively high proportion of the entire grid load, the operation period is relatively concentrated, and the demand for grid capacity is getting higher and higher. Innovatively introduce energy storage batteries, cut into the energy storage system as the power supply for air-conditioning loads during the peak period of electricity load, cut peaks and adjust valleys, and actively participate in power grid dispatching.
(2)空调负荷全年度利用率不高，从性价比最优角度，在储能系统与变换器直流母线之间创新性设计双向DC-DC充放电电路。降低系统设计成本，缩小控制器占用空间大小。(2) The annual utilization rate of the air-conditioning load is not high. From the perspective of optimal cost performance, a bidirectional DC-DC charging and discharging circuit is innovatively designed between the energy storage system and the DC bus of the converter. Reduce system design cost and reduce controller footprint.
(3)针对节能变频运行产生的谐波，综合采用固定滤波电路与嵌入智能控制技术，在直流母线处引进能消除部分谐波及抑制低电压穿越的Z型电路，大容量电容较好避免变换器两侧的谐波源相互作用，预防催生新的谐波类型，同时预防电网电压跌落对负荷造成不利影响。简单滤波电路滤去高次谐波。智能控制紧密结合负荷侧谐波监测，滤除低次谐波。(3) For the harmonics generated by energy-saving frequency conversion operation, a fixed filter circuit and embedded intelligent control technology are comprehensively used, and a Z-type circuit that can eliminate part of the harmonics and suppress low-voltage ride-through is introduced at the DC bus. Large-capacity capacitors are better to avoid conversion. Harmonic sources on both sides of the inverter interact to prevent new harmonic types from being generated, and at the same time prevent grid voltage drops from causing adverse effects on loads. A simple filter circuit filters out higher harmonics. Intelligent control is closely combined with load-side harmonic monitoring to filter out low-order harmonics.
（4）有效利用储能电池寿命，运用优化协同控制及调度策略，实现友好用电，达到有效节能。(4) Effectively utilize the service life of energy storage batteries, and use optimized collaborative control and scheduling strategies to achieve friendly power consumption and effective energy saving.
附图说明Description of drawings
下面结合附图和实施例对本发明的技术方案进行详细说明：The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing and embodiment:
图1是本发明设计的一种基于电能友好空调负荷侧主动需求策略功能模块连接控制示意图；Fig. 1 is a schematic diagram of the connection control of functional modules based on the active demand strategy of the load side of the electric energy-friendly air conditioner designed by the present invention;
图2是本发明设计的一种基于电能友好空调负荷侧主动需求策略的功能模块调度示意图；Fig. 2 is a schematic diagram of functional module scheduling based on an active demand strategy on the load side of an electric energy-friendly air conditioner designed by the present invention;
图3是本发明设计的一种基于电能友好空调负荷侧主动需求策略的硬件结构示意图；Fig. 3 is a schematic diagram of the hardware structure of an active demand strategy based on the load side of the electric energy-friendly air conditioner designed by the present invention;
图4是本发明设计的一种基于电能友好空调负荷侧主动需求策略所要解决变频控制馈线谐波示意图。Fig. 4 is a schematic diagram of frequency conversion control feeder harmonics to be solved by an active demand strategy based on the load side of an electric energy-friendly air conditioner designed in the present invention.
具体实施方式Detailed ways
实施例1：Example 1:
如图1所示，本发明设计了一种基于电能友好空调负荷侧主动需求策略，所采用硬件包括：电网接口模块、削峰填谷控制模块、舒适度兼节能控制模块。As shown in Figure 1, the present invention designs an active demand strategy based on the energy-friendly air conditioner load side. The hardware used includes: a power grid interface module, a peak-shaving and valley-filling control module, and a comfort and energy-saving control module.
步骤一，供电侧与负荷侧之间直流母线侧设计Z型低电压穿越及谐波预防电路，在非线性负荷群变频启动时缓冲电流突变对电网的影响。Step 1: Design a Z-type low voltage ride-through and harmonic prevention circuit on the DC bus side between the power supply side and the load side to buffer the impact of sudden current changes on the power grid when the nonlinear load group starts with variable frequency.
步骤二，设置电网监测，严重低电压穿越及电网其它紧急电网故障故障下，紧急切断电网侧电源供应，硬件互锁联动电路启动储能电源供电直流母线，通过DC-AC逆变供电负载工作。Step 2: Set up grid monitoring. Under severe low voltage ride-through and other emergency grid faults, cut off the power supply on the grid side in an emergency, and the hardware interlock linkage circuit starts the DC bus powered by the energy storage power supply, and the load is powered by the DC-AC inverter.
步骤三，紧密结合负荷预测，电池储能与负荷错峰管理相结合，直流母线与储能电池之间双向充放电电路，在用电低谷时段充分利用电能进行储能，用电高峰时段储能释放，实现部分负荷移峰填谷，保证空调负荷正常运行。当用电高峰电池荷电状态不足以维持负荷正常运行，同时室内温度及湿度监测在人体适应度一定范围内时，结合中央空调系统在冷热源发挥作用或消退方面存在的时间延迟特性，临时采用空调系统设备暂停策略。Step 3, closely combined with load forecasting, battery energy storage and load staggered management, bidirectional charging and discharging circuit between DC bus and energy storage battery, making full use of electric energy for energy storage during low power consumption periods, and energy storage during peak power consumption periods release, to realize part of the load shift peak to fill the valley, to ensure the normal operation of the air conditioning load. When the state of charge of the battery during the peak power consumption is not enough to maintain the normal operation of the load, and the indoor temperature and humidity monitoring are within a certain range of human body adaptability, combined with the time delay characteristics of the central air-conditioning system in terms of the effect or fading of the cold and heat sources, temporary Adopt an air conditioning system equipment suspension strategy.
实施例1：Example 1:
作为具体实施例一的一个电能友好空调负荷侧主动需求策略硬件设备实施例，如图2所示，具体包括：As a specific embodiment 1, an embodiment of an active demand policy hardware device on the load side of an electric energy-friendly air conditioner, as shown in FIG. 2 , specifically includes:
谐波处理与低电压穿越电路设计Harmonic Processing and Low Voltage Ride Through Circuit Design
空调负荷采用变频节能运行调节方式，在电网与变频系统及变频系统与负荷之间设计LC滤波电路，滤去一部分高频谐波，中间直流母线设计Z型电路主要为了预防低电压穿越对设备影响，作为滤波电路可再滤去一部分谐波。通过供电侧与负荷侧之间设计谐波处理及低电压穿越预防电路，避免非线性负荷变频启动及工作时对电网的影响。The air-conditioning load adopts the frequency conversion energy-saving operation adjustment method, and an LC filter circuit is designed between the power grid and the frequency conversion system and between the frequency conversion system and the load to filter out part of the high-frequency harmonics. , as a filter circuit can filter out some harmonics. Harmonic processing and low voltage ride-through prevention circuits are designed between the power supply side and the load side to avoid the impact on the power grid during variable frequency startup and operation of non-linear loads.
严重低电压穿越及电网其它紧急故障下储能电路接入设计Energy storage circuit connection design under severe low voltage ride through and other emergency faults of power grid
储能电池技术不断进步，容量也越来越高，其能量完全能够供给中小功率分布式空调负荷的峰值时段用电需求，系统设计紧密结合电网故障监测，在空调负荷系统电源供应中灵活切入储能电池，用来控制直流母线端电压，设计合理双向充放电电路，缓冲大量空调集中时段内运行对电网造成的供电压力。当系统检测到电压大幅跌落用电高峰时，紧急切断电网侧电源供应，硬件互锁联动电路启动储能电源供电直流母线，通过DC-AC逆变供电负载工作。储能侧电源及时切入，维持空调负荷可靠正常运行，减少负荷端设备损坏。Energy storage battery technology continues to improve, and its capacity is getting higher and higher. Its energy can fully supply the power demand of small and medium-power distributed air-conditioning loads during peak hours. The energy battery is used to control the DC bus terminal voltage, and a reasonable two-way charging and discharging circuit is designed to buffer the power supply pressure caused by the operation of a large number of air conditioners during the centralized period. When the system detects that the voltage drops sharply to the peak of power consumption, it will cut off the power supply on the grid side urgently, and the hardware interlock linkage circuit will start the DC bus powered by the energy storage power supply, and the load will work through the DC-AC inverter. The power supply on the energy storage side is cut in in time to maintain the reliable and normal operation of the air-conditioning load and reduce the damage to the load-side equipment.
电池储能与负荷错峰管理设计Design of battery energy storage and load staggered peak management
紧密结合负荷预测，引进储能电池，在用电低谷时段充分利用电能进行储能，用电高峰时段储能释放，实现电网负荷移峰填谷，维持负荷正常运行。当用电高峰电池荷电状态不足以维持负荷正常运行，同时室内温度及湿度监测在人体适应度一定范围内时，由于央空调系统从制冷机产生冷量到传送至末端发挥作用，或停机到室内冷热源所释放能量完全消退有20-30分钟的延迟，可临时采用空调系统设备暂停策略，储能系统根据电网监测情况间断充电。Closely combined with load forecasting, energy storage batteries are introduced to make full use of electric energy for energy storage during low power consumption periods, and release energy storage during peak power consumption periods, so as to realize load shifting of power grids and maintain normal load operation. When the state of charge of the battery during the peak power consumption is not enough to maintain the normal operation of the load, and the indoor temperature and humidity monitoring are within a certain range of human body adaptability, the central air-conditioning system will work from the cooling generated by the refrigerator to the end, or shut down to the end. There is a delay of 20-30 minutes for the energy released by the indoor cold and heat sources to completely dissipate. The air-conditioning system equipment suspension strategy can be temporarily adopted, and the energy storage system is intermittently charged according to the grid monitoring situation.
双向DC-DC控制器设计Bidirectional DC-DC Controller Design
由于系统中储能电池充当电网负荷与空调电源的双面角色，涉及功率频繁流入及流出，如果系统选用单向功率流DC-DC变换器，需要两个变换器，增加了设计成本，也增加了装置空间体积，因此，课题考虑空调负荷全年度利用率不高因素，从性价比最优角度，选用双向DC-DC控制电路。Because the energy storage battery in the system acts as the double-sided role of the grid load and the air-conditioning power supply, involving frequent inflow and outflow of power, if the system uses a unidirectional power flow DC-DC converter, two converters are required, which increases the design cost and increases Therefore, the subject considers the factor that the annual utilization rate of the air-conditioning load is not high, and selects a bidirectional DC-DC control circuit from the perspective of optimal cost performance.
实施例3：Example 3:
如图2，图3所示，作为本发明的一种基于电能友好空调负荷侧主动需求策略功能模块调度策略示意图。采用电网友好负荷硬件电路设计与嵌入编程技术相结合，电池储能系统的运行在时序上必须紧密结合电网状态监测信号及空调负荷预测信号，一个总的优化调度模块可以协调整个系统各子模块运行。实施具体步骤如下：As shown in FIG. 2 and FIG. 3 , it is a schematic diagram of a scheduling strategy of a functional module based on an active demand strategy on the load side of an electric energy-friendly air conditioner according to the present invention. Using the combination of grid-friendly load hardware circuit design and embedded programming technology, the operation of the battery energy storage system must be closely combined with the grid status monitoring signal and air-conditioning load forecast signal in terms of timing, and a general optimal scheduling module can coordinate the operation of each sub-module of the entire system . The specific steps for implementation are as follows:
步骤1，根据负荷预测，当检测有启动要求时，检测当前电网负荷情况，判断是否处于需求高峰时段；Step 1. According to the load forecast, when there is a start-up request detected, the current grid load is detected to determine whether it is in the peak demand period;
步骤2，如果是高峰时段，首选储能供电，负荷离网运行，与此同时测试荷电状态，判断荷电状态情况。如果不是高峰时段，判断是否用电低谷，利用用电低谷时段储能，直到储满为负荷高峰时段到来作准备。如果不是高峰也不是低谷，负荷并网正常运行。当并网运行时刻关注电网低电压与电网故障情况；Step 2, if it is peak hours, energy storage power supply is the first choice, the load runs off-grid, and at the same time test the state of charge to judge the state of charge. If it is not the peak period, judge whether the power consumption is low, and use the energy storage during the low power consumption period until the storage is full to prepare for the arrival of the peak load period. If it is neither peak nor trough, the load grid will run normally. Pay attention to grid low voltage and grid faults when grid-connected operation;
步骤3，当储能电池耗电到荷电状态不足以继续供电维持负荷运行时，电网无电压跌落或电网故障时，负荷并网运行。如果电网有电压跌落或电网故障时，负荷短暂停机20-30分钟；Step 3. When the energy storage battery is depleted to a state of charge that is not enough to continue supplying power to maintain load operation, and the grid has no voltage drop or grid failure, the load runs in parallel to the grid. If the power grid has a voltage drop or a grid failure, the load will be temporarily shut down for 20-30 minutes;
步骤4，监测谐波情况，以程序参数动态修正，去除硬件电路未能处理的谐波，再返回负荷预测。Step 4, monitor the harmonics, dynamically modify the program parameters, remove the harmonics that cannot be processed by the hardware circuit, and then return to load forecasting.
图4简单描述一种基于电能友好空调负荷侧主动需求策略中空调负荷谐波情况。变频空调在电网故障时吸收的无功不大，而变频空调运行所引起的谐波不可忽视，变频空调由于变频器的输入侧为整流回路，具有非线性特性，产生的高次谐波使电流源或电压源波形发生畸变。图中馈线上的相比i0输入端起始端ii，发生了畸变，同时，变频器输出电路是脉宽调制控制电路，使输出的电压电流也产生高次谐波。Figure 4 briefly describes the condition of air-conditioning load harmonics in an active demand strategy based on the power-friendly air-conditioning load side. The reactive power absorbed by the inverter air conditioner is not large when the power grid fails, and the harmonics caused by the operation of the inverter air conditioner cannot be ignored. Since the input side of the inverter is a rectifier circuit, the inverter air conditioner has nonlinear characteristics, and the high-order harmonics generated make the current The source or voltage source waveform is distorted. Compared with the i0 input terminal ii on the feeder line in the figure, distortion has occurred. At the same time, the output circuit of the frequency converter is a pulse width modulation control circuit, so that the output voltage and current also generate high-order harmonics.
本发明采用上述技术方案，具有以下有益效果：The present invention adopts the above-mentioned technical scheme, and has the following beneficial effects:
1.电网负荷运行需求高峰时段，储能灵活接入，维持空调负荷可靠正常运行，避免负荷端设备损坏；缓冲大量空调集中时段内运行对电网造成的供电压力。1. During the peak hours of power grid load operation demand, energy storage can be flexibly connected to maintain reliable and normal operation of air-conditioning loads and avoid damage to load-side equipment; buffer the power supply pressure on the power grid caused by the operation of a large number of air-conditioners during concentrated periods.
2.利用电网负荷需求低谷时段储能，需求峰值释放储能，起到削峰调谷作用。2. Utilize the energy storage during the trough period of the grid load demand, and release the energy storage during the peak demand, so as to play the role of peak shaving and valley adjustment.
3.谐波采用软硬件相结合方式，这种方法与单靠无源滤波器消除部分谐波的方法相比，显然在源头直接进行谐波处理效果更佳，直流部分接有Z型LC电路，同时也提升电路抵抗电压瞬间波动的能力。总的来说，RLC滤波电路略去高次谐波，先进嵌入控制器可消除低次谐波。3. Harmonics adopt a combination of software and hardware. Compared with the method of eliminating partial harmonics by passive filters alone, it is obviously better to directly process harmonics at the source, and the DC part is connected with a Z-type LC circuit. , and also improve the ability of the circuit to resist instantaneous voltage fluctuations. In general, the RLC filter circuit omits high-order harmonics, and the advanced embedded controller can eliminate low-order harmonics.
4.储能系统与变流器直流母线间接入双向DC-DC控制电路，节省成本，提高性价比。4. A bidirectional DC-DC control circuit is connected between the energy storage system and the DC bus of the converter to save costs and improve cost performance.
| Application Number | Priority Date | Filing Date | Title |
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| CN201710100462.4ACN106849062B (en) | 2015-05-14 | 2015-05-14 | Reduce system cost based on electric energy close friend's air conditioner load side active demand method |
| CN201710100461.XACN106949595B (en) | 2015-05-14 | 2015-05-14 | Effective energy-saving method based on energy-friendly air conditioning load-side active demand |
| CN201510243894.1ACN104807143B (en) | 2015-05-14 | 2015-05-14 | Active demand strategy based on energy-friendly air conditioner load side |
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| CN201510243894.1ACN104807143B (en) | 2015-05-14 | 2015-05-14 | Active demand strategy based on energy-friendly air conditioner load side |
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| CN201710100462.4ADivisionCN106849062B (en) | 2015-05-14 | 2015-05-14 | Reduce system cost based on electric energy close friend's air conditioner load side active demand method |
| CN201710100461.XADivisionCN106949595B (en) | 2015-05-14 | 2015-05-14 | Effective energy-saving method based on energy-friendly air conditioning load-side active demand |
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| CN201710100461.XAActiveCN106949595B (en) | 2015-05-14 | 2015-05-14 | Effective energy-saving method based on energy-friendly air conditioning load-side active demand |
| CN201510243894.1AExpired - Fee RelatedCN104807143B (en) | 2015-05-14 | 2015-05-14 | Active demand strategy based on energy-friendly air conditioner load side |
| CN201710100462.4AActiveCN106849062B (en) | 2015-05-14 | 2015-05-14 | Reduce system cost based on electric energy close friend's air conditioner load side active demand method |
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| CN201710100461.XAActiveCN106949595B (en) | 2015-05-14 | 2015-05-14 | Effective energy-saving method based on energy-friendly air conditioning load-side active demand |
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| CN201710100462.4AActiveCN106849062B (en) | 2015-05-14 | 2015-05-14 | Reduce system cost based on electric energy close friend's air conditioner load side active demand method |
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